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CN-116905998-B - Metal spraying type downhole casing in-situ repairing tool and method

CN116905998BCN 116905998 BCN116905998 BCN 116905998BCN-116905998-B

Abstract

The invention discloses a metal spraying type downhole casing in-situ repairing tool and a method, and belongs to the technical field of casing repairing of oil and gas wells. The metal spraying type in-situ repair tool for the underground casing comprises an upper joint, an upper shell, a lower shell and a suspension joint, wherein a high-pressure gas spraying device, an alloy storage heating device and a rotary spraying device are sequentially arranged in the upper shell, the lower shell and the suspension joint along the axial direction.

Inventors

  • LIU GONGHUI
  • WANG WEI
  • ZHA CHUNQING

Assignees

  • 北京工业大学

Dates

Publication Date
20260505
Application Date
20230831

Claims (9)

  1. 1. The metal spraying type downhole casing in-situ repair tool is characterized by comprising an upper connector, an upper shell, a lower shell, a suspension connector, a high-pressure gas spraying device, an alloy storage heating device and a rotary spraying device, wherein the upper connector, the upper shell, the lower shell and the suspension connector are sequentially connected from top to bottom; The high-pressure gas injection device comprises a gas storage tank, an electromagnetic pressure relief valve, a pipe joint and a high-pressure pipeline, wherein the gas storage tank is fixedly arranged in a central hole of an upper shell, a gas outlet is arranged at one end, far away from the upper joint, of the gas storage tank, the upper end of the electromagnetic pressure relief valve is connected to the outlet position of the gas storage tank, the lower end of the electromagnetic pressure relief valve is connected with the high-pressure pipeline through the pipe joint, an end cover is arranged at one end, facing the gas storage tank, of a filling cylinder, an accommodating cavity is formed among the lower end of the end cover of the filling cylinder, the inner side wall of the filling cylinder and the upper end of the heating cylinder, and alloy materials for sleeve repair are arranged in the accommodating cavity; The alloy storage heating device comprises a power supply control system, a filling cylinder, a heating cylinder and a coil, wherein the filling cylinder is coaxially and fixedly arranged in a central hole of the lower shell, the power supply control system is fixedly arranged at the upper end of the filling cylinder, and one end, facing a suspension joint, of the filling cylinder is coaxially and detachably fixedly connected with the heating cylinder; The rotary spraying device comprises a rotary impeller, a rotary spray head and a spray nozzle, wherein the rotary impeller is coaxially and rotatably arranged in a central hole of the suspension joint, the rotary spray head is coaxially and detachably fixedly connected with the rotary impeller, and one end of the rotary spray head, which faces to the upper joint, is abutted against the heating cylinder of the alloy; The rotary spray head is the toper, the one end that the conical roof was kept away from to the rotary spray head sets up annular boss, and annular boss inside coaxial setting a hollow cylinder, rotary spray head lateral wall middle part sets up a plurality of round holes along circumference equipartition, the terminal surface set up the passageway with hollow cylinder's centre bore intercommunication in the round hole, rotary spray head's terminal surface is located between annular boss inner wall and hollow cylinder outer wall surface, sets up and runs through hole and lateral wall round hole intercommunication.
  2. 2. The tool for in-situ repair of metal spraying type underground casing according to claim 1, wherein the nozzle is a hollow cylinder, a groove is formed in the outer side wall of the hollow cylinder along the circumferential direction, a plurality of through holes are uniformly formed in the groove, and the axes of the through holes are arranged at an acute angle with the axis of the hollow cylinder of the nozzle.
  3. 3. The metal spraying type downhole casing in-situ repairing tool according to claim 1, wherein the rotary impeller is a hollow cylinder, a plurality of blades are uniformly distributed on the inner side wall of the upper end of the hollow cylinder of the rotary impeller along the circumferential direction, a step surface is arranged in the middle of the outer side wall of the hollow cylinder of the rotary impeller, a thrust centralizing bearing is arranged at the lower end of the step surface, and the thrust centralizing bearing is seated on the upper end surface of an inner step of the suspension joint.
  4. 4. The metal sprayed downhole casing in-situ repair tool of claim 1, wherein the alloy material is provided in a powder, granular or block form.
  5. 5. The metal spraying type downhole casing in-situ repairing tool according to claim 1 or 4, wherein a funnel-shaped middle hole is formed in the alloy heating cylinder, a step surface is formed in the middle of the outer side wall, and the coil is spirally wound on the outer wall of the lower end of the step surface of the heating cylinder.
  6. 6. A metal spraying type downhole casing in-situ repairing tool as claimed in claim 1 or 3, wherein the high-pressure pipelines are arranged in a plurality of ways uniformly distributed on the outer side of the filling cylinder along the circumferential direction, the lower part of the high-pressure pipelines is arranged on the outer side of the heating cylinder in a spiral shape, and the spiral direction is consistent with the rotation direction of the rotating impeller.
  7. 7. The tool of claim 1, wherein the power control system is connected to the coil by a wire, the power control system and the coil being capable of generating heat from electrical energy provided from the surface within the alloy cartridge to melt the alloy material.
  8. 8. The metal spraying type downhole casing in-situ repairing tool according to claim 1,2 or 7, wherein the nozzle is coaxially and fixedly arranged in a side wall round hole of the rotary nozzle, and the middle through hole of the heating cylinder, the cylindrical center hole of the rotary nozzle, the through hole of the rotary nozzle and the center hole of the nozzle form a liquid alloy flow channel.
  9. 9. The metal spraying type downhole casing in-situ repairing method is characterized by comprising the following steps of: providing a metal spraying type downhole casing in-situ repairing tool according to any one of claims 1-8; The metal spraying type downhole casing in-situ restoration tool is put into a position to be restored of a casing in a shaft, the electromagnetic pressure relief valve is controlled to be opened, and high-pressure gas is sprayed out to clean the inner wall of the casing; The spraying repair comprises the steps of switching on a power supply in ground operation, controlling the power supply control system and the coil to work, generating induction current in the alloy heating cylinder to generate heat, enabling the alloy material to absorb the heat and start to melt and flow to the nozzle along a liquid alloy flow channel, controlling the electromagnetic relief valve to be opened, spraying high-pressure gas from a pipeline to blow the rotating impeller to rotate, enabling the high-pressure gas to flow into the nozzle from a through hole of the rotating nozzle, spraying the liquid alloy to the damaged position of the inner wall of the sleeve, slowly lifting or lowering the tool in the spraying process, and solidifying the sprayed liquid alloy on the inner wall of the sleeve to form a cylindrical plugging repair layer until the damaged sleeve is repaired.

Description

Metal spraying type downhole casing in-situ repairing tool and method Technical Field The invention relates to the technical field of oil and gas well casing repair, in particular to a metal spraying type downhole casing in-situ repair tool and method. Background Casing is typically provided in hydrocarbon wellbores to isolate the oil, gas, water and complex horizons, providing a passageway for the hydrocarbon from the producing zone to the surface. The complete sleeve is a key for supporting the wall of the oil and gas well and ensuring the smooth drilling process and normal production of the oil and gas well after completion. With the exploitation and production of underground oil and gas resources, the inner sleeve of a shaft is easy to be damaged in different forms such as leakage, cracking, corrosion perforation and the like due to the long-term corrosion of underground fluid, frequent abrasion of well repair production operation and formation stress change. The damage of the sleeve in the shaft is easy to cause the accidents of production stopping and even scrapping of the oil-gas well, and huge economic loss is brought, so that the damaged sleeve needs to be plugged and repaired in time, and the smooth production process of the oil-gas well is ensured. The method for repairing the underground casing comprises the steps of 1, taking out the damaged section of the casing and the casing above, putting a new casing into butt joint with the casing of the well to completely repair the damaged casing, 2, putting a corrugated pipe or an expansion pipe into the inside of the damaged perforation position of the casing, expanding the corrugated pipe or the expansion pipe by a hold-down pressure or a matched tool, and attaching the corrugated pipe or the expansion pipe to the damaged position of the casing for repairing, 3, adopting cement to form a cement ring at the damaged position of the casing to seal the damaged casing, and 4, injecting the cement to repair the damaged casing by extruding a physical plugging agent or a chemical plugging agent into the lost well section, and achieving the purpose of sealing the damaged casing after the plugging agent is solidified. In the sleeve repairing method, the replacement sleeve repairing and repair repairing methods have the problems of complicated plugging repairing operation procedures and high cost, and the cement repairing method and the glue injection repairing method have the problems that cement paste and plugging agent are difficult to stay in micropores, and the solidified cement, plugging agent and sleeve have low cementing strength and are easy to repeatedly leak in high-pressure operation in later period. With the reasons and complexity and variety of forms of wellbore casing damage, there is an increasing demand for casing repair, which is not well addressed by the above casing repair techniques. Therefore, the casing repair tool and the casing repair method have important significance, are simple to operate, can perform casing repair in situ in the pit, and have the strength meeting the production operation requirement after repair. Disclosure of Invention In view of the problems of complicated repairing operation, high cost and low repairing strength of the oil-gas well casing, the invention provides a metal spraying type downhole casing in-situ repairing tool and a metal spraying type downhole casing in-situ repairing method, alloy with high strength and low melting point is selected as a casing repairing material, the alloy material is melted underground in an electromagnetic induction heating mode, and the plugging repairing work of the damaged casing is carried out through gas dynamic spraying and material adding, so that the in-situ plugging repairing of the downhole damaged casing is rapidly and effectively completed, the operation steps of the downhole casing repairing are simplified, and the working efficiency of the downhole casing repairing is remarkably improved. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a metal spraying type downhole casing in-situ repair tool which comprises an upper joint, an upper shell, a lower shell, a suspension joint, a high-pressure gas spraying device, an alloy storage heating device and a rotary spraying device, wherein the upper joint, the upper shell, the lower shell and the suspension joint are sequentially connected from top to bottom; the high-pressure gas injection device comprises a gas storage tank, an electromagnetic pressure relief valve, a pipe joint and a high-pressure pipeline, wherein the gas storage tank is fixedly arranged in a central hole of the upper shell, a gas outlet is arranged at one end, far away from the upper joint, of the gas storage tank, the upper end of the electromagnetic pressure relief valve is connected to the outlet position of the gas storage tank, and the lower end of the electromagnetic pres